UN R79 Supplement 3 (04 series) · UNECE Regulation No. 79 (ECE R79) — Uniform provisions concerning the approval of vehicles with regard to steering equipment.
UN R79 — Supplement 3 to the 04 series of amendments
Supplement 2 → 3
- What changed
- New paragraphs 5.6.4.8.1.2. and 5.6.4.8.1.3. cover N2 and N3 vehicles able to assist lane change when coupled to an O3 or O4 trailer.
- New paragraph 5.6.4.9. applies to vehicles implementing lane change function(s) based on trailers supporting lane change function(s). For these vehicles, the data communication line must conform to ISO 11992-1:2019 and ISO 11992-3:2021.
- New Annex 9 lists the ISO 11992-3:2021 messages that the towing vehicle or trailer must support, as appropriate. New Annex 10 gives a test procedure to assess the functional compatibility of vehicles equipped with ACSF control lines.
- Why
- The main aim of the proposal for ACSF of Category C is to include a truck–trailer data transmission.
- A second proposal aims to correct errors: the word “indefinitively” in paragraph 5.3.3.1. and text omitted from Annex 8, paragraph 3.5.4.1.
Q1What changed202 changes
Definitions for combinations and data communication (paras. 2.4.17., 2.7., 2.8. and 2.9.)
In the definition of “Lane Change Manoeuvre” (paragraph 2.4.17.), sub-paragraphs (a) and (b) now refer to the wheels of the “power-driven vehicle” instead of “the vehicle”. Sub-paragraph (b) also adds the words “(or combination)”. “Electric control line” (paragraph 2.7.) now means the electrical connection between two vehicles which provides the steering control function to a towed vehicle within a combination. Before this supplement, the definition said “to the trailer”. New paragraphs 2.8. and 2.9. define “Data communication” and “Point-to-point”.
Rear detection and minimum operation speed (paras. 5.6.4. and 5.6.4.8.1. to 5.6.4.8.4.)
Paragraph 5.6.4. now covers power-driven vehicles equipped with an ACSF of Category C and trailers supporting lane change function(s). New paragraph 5.6.4.8.1.1. covers power-driven vehicles able to assist lane change in solo condition, and trailers of Category O3 or O4 supporting lane change function(s). For trailers supporting lane change function, the detection area of paragraph 5.6.4.8.2. must be extended to the sides of the trailer including the coupling device. The minimum operation speed formula is now in paragraph 5.6.4.8.1.4., the former paragraph 5.6.4.8.1. Paragraph 5.6.4.8.3. now refers to detection by the system of the power-driven vehicle or the trailer (as relevant). Paragraph 5.6.4.8.4. now refers to sensor blindness on the power-driven vehicle or on the trailer, as relevant.
Lane change by N2 and N3 vehicles coupled to an O3 or O4 trailer (paras. 5.6.4.8.1.2. and 5.6.4.8.1.3.)
New paragraphs 5.6.4.8.1.2. and 5.6.4.8.1.3. cover N2 and N3 vehicles able to assist lane change when coupled to an O3 or O4 trailer. With a trailer supporting lane change functions, the detection area covers the sides of the power-driven vehicle; detection behind its rearmost point is optional. If the trailer does not fulfil paragraph 5.6.4.9., the ACSF-C must be deactivated unless the vehicle can assist lane change as specified in paragraph 5.6.4.8.1.3. With a trailer not supporting lane change functions, the declared Srear (not less than 55 m) is specified to the rearmost point of the trailer. The manufacturer must also declare the maximum trailer length LT up to which the vehicle can perform a lane change manoeuvre. If the coupled trailer is longer than LT or its length is not available, the ACSF-C must be deactivated (off mode).
Connections for ACSF between power-driven vehicle and trailer (paras. 5.6.4.5.5.1. and 5.6.4.9.)
New paragraph 5.6.4.9. applies to vehicles implementing lane change function(s) based on trailers supporting lane change function(s). The data communication line must conform to ISO 11992-1:2019 and ISO 11992-3:2021 and be a point-to-point type. A continuous failure (> 40 ms) in the electric control line to a trailer must be detected in the power-driven vehicle and signalled to the driver. With a coupled trailer, the power-driven vehicle must send GPM 11 to the trailer and receive GPM 21 before it enables the ACSF function. Under new paragraph 5.6.4.5.5.1., the system failure signal from a trailer of Category O3 or O4 supporting lane change function(s) must trigger the warning signal. Former paragraphs 5.6.4.9. and 5.6.4.10. are now paragraphs 5.6.4.10. and 5.6.4.11.
New Annex 1 paragraphs and Annex 8 tests for lane change with a trailer
New paragraphs 7.3. to 7.3.3. in Annex 1 record (yes/no) the ACSF of Category C and the lane change cases of the power-driven vehicle. The cases are: solo condition, coupled to a trailer supporting lane change function(s), and coupled to a trailer without its support. New paragraph 8.4. in Annex 1 records (yes/no) whether the trailer is equipped with an ACSF of Category C supporting lane change function(s). Annex 8, paragraph 3.5., now says which tests apply to each case, with the trailer coupled during the test for the trailer cases. A trailer supporting lane change function must fulfil the tests of paragraphs 3.5.6. and 3.5.9. New paragraph 3.5.8. is a lane change suppression test, and new paragraph 3.5.9. is an object detection test for trailers supporting lane change function(s).
New Annexes 9 and 10: ISO 11992 data transmission and compatibility tests
New Annex 9 covers the compatibility between towing vehicles and trailers with regard to data transmission according to ISO 11992 for environmental monitoring. It applies only to towing vehicles and trailers equipped with an electric control line as defined in paragraph 2.7. It lists the ISO 11992-3:2021 messages that the towing vehicle or trailer must support, as appropriate. The support of all other messages defined within ISO 11992-3:2021 is optional. New Annex 10 gives an optional procedure to check towing and towed vehicles with an electric control line against the requirements of paragraph 5.6.4.1. Alternative procedures may be used at the discretion of the Technical Service if an equivalent level of checking integrity can be established.
Corrections in paragraph 5.3.3.1. and Annex 8, paragraph 3.5.4.1.
Paragraph 5.3.3.1. now says “indefinitely” instead of “indefinitively”. In Annex 8, paragraph 3.5.4.1., test condition (f) now ends with “or 7.0 seconds if initiated by a second deliberate action”. New test condition (g) reads “The second deliberate action for an appropriate system is performed later than 5.0 seconds after the initiation of the lane change procedure”.
Q2Why it changed
- Proposed by
- Experts from the International Organization of Motor Vehicle Manufacturers and the European Association of Automotive Suppliers; corrections by the expert from OICA
- Working party
- GRVA, 12th session (January 2022)
Reasons
The proposal amends the provisions for ACSF of Category C. Its main aim is to include a truck–trailer data transmission.
Sources (2)
“This document proposes amendments to the provisions of ACSF of Category C in UN Regulation No. 79, with the main aim to include a truck – trailer data transmission.”
“aimed to include truck-trailer data transmission in the Automatically Commanded Steering Functions (ACSF) of Category C provisions in UN Regulation No. 79”
The second proposal aims to correct several errors found in the text of the Regulation.
Source
“It aims at correcting several errors found in the text of the regulation.”
The word “indefinitively” in paragraph 5.3.3.1. should read “indefinitely”. This error was introduced with Revision 3 of the Regulation.
Source
“The word “indefinitively” should read “indefinitely”. This error was introduced with the Revision 3 of the regulation.”
In Supplement 4 to the 03 series, the end of sub-paragraph (f) and sub-paragraph (g) of Annex 8, paragraph 3.5.4.1. were omitted by error. The proposal aims to correct that error.
Sources (2)
“The end of the sub-paragraph (f) and the full sub-paragraph (g) in Annex 8 paragraph 3.5.4.1. were however erroneously omitted in Supplement 4 to the 03 series of amendments to UN Regulation No. 79”
“erroneously omitted in Supplement 4 to the 03 series of amendments to UN Regulation No. 79 (document ECE/TRANS/WP.29/2021/14). The present document aims at correcting that error.”
Document trail
- 2020-11ProposalECE/TRANS/WP.29/GRVA/2021/11Proposal from OICA and CLEPA for the truck–trailer data transmission
- 2021-11ProposalECE/TRANS/WP.29/GRVA/2022/6Proposal from OICA to correct errors
- —RevisedGRVA-12-19Revised proposal introduced by the expert from OICA
- —Amended in sessionGRVA-12-43Amendments to ECE/TRANS/WP.29/GRVA/2022/6 adopted at the session
- —Working party adoptsECE/TRANS/WP.29/GRVA/12Session report, paras. 65 and 66
- 2022-04Sent to WP.29ECE/TRANS/WP.29/2022/81Text that GRVA sent to WP.29 and AC.1
- 2022-06WP.29 adoptsECE/TRANS/WP.29/1166Adopted at the 187th session (session report, para. 182)
- 2023-01-04In forceC.N.483.2022.TREATIES-XI.B.16.79UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Decide which lane change cases of paragraphs 5.6.4.8.1.1. to 5.6.4.8.1.3. your vehicle with an ACSF of Category C supports.
- Under paragraph 5.6.4.8.1.3., declare Srear specified to the rearmost point of the trailer (not less than 55 m).
- Under paragraph 5.6.4.8.1.3., declare the maximum trailer length LT.
- Make sure the ACSF-C is deactivated if the trailer is longer than LT or its length is unknown (paragraph 5.6.4.8.1.3.).
- For lane change with a supporting trailer (paragraph 5.6.4.8.1.2.), make sure the vehicle fulfils paragraph 5.6.4.9.
Component supplier
- Make sure a trailer with ACSF sensors and data communication on the electric control line conforms to ISO 11992-3:2021.
- Use Annex 9 to find which ISO 11992-3:2021 messages the towing vehicle or trailer must support.
- Make sure a system failure in the trailer is transmitted to the motor vehicle (paragraph 5.6.4.9.2.3.).
- Be ready to supply the Technical Service with the information document of Annex 10, paragraph 2.1.
Technical service / Approval authority
- Be ready to check vehicles with electric control lines against the relevant provisions of ISO 11992-1:2019 and ISO 11992-3:2021.
- Be ready to check the demonstration that ACSF-C is deactivated above LT or with unknown trailer length (paragraph 5.6.4.8.1.3.).
- Test trailers supporting lane change function(s) to Annex 8, paragraphs 3.5.6. and 3.5.9.
- For the trailer cases, test the power-driven vehicle with the trailer coupled, as Annex 8 specifies.
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More UN R79 change reports
- 05 series — Supplement 1
- 05 series — Base text
- 04 series — Supplement 12
- 04 series — Supplement 11
- 04 series — Supplement 10
- 04 series — Supplement 9
- 04 series — Supplement 8
- 04 series — Supplement 7
- 04 series — Supplement 6
- 04 series — Supplement 5
- 04 series — Supplement 4
- 04 series — Supplement 2
- 04 series — Supplement 1
- 04 series — Base text
- 03 series — Supplement 17
- 03 series — Supplement 16
- 03 series — Supplement 15
- 03 series — Supplement 14
- 03 series — Supplement 13
- 03 series — Supplement 12
- 03 series — Supplement 11
- 03 series — Supplement 10
- 03 series — Supplement 9
- 03 series — Supplement 8
- 03 series — Supplement 7
- 03 series — Supplement 6
- 03 series — Supplement 5
- 03 series — Supplement 4
- 03 series — Supplement 3
- 03 series — Supplement 2
- 03 series — Supplement 1